Sheave



Patented June 3, 1930,

UNITED srrl ras PATENT OFFICE EDGAR E. GREVE, OF BELLEVUE, PENNsYLvA IA,ssieNoR'ro 01L WELL SUPPLY comPANY, F PITTSBURGH, PENNSYLVANIA, AooRroRA'rIoN or PENNSYLVANIA SHEAVE Application filed June 24,

. my invention are particularly designed for V 5 use in connection withoil well drilling rigs using wire rope transmission, and it is of greatimportance to provide a good wear ing surface for the groove in whichthe wire rope is positioned. V I

Sheaves have heretofore beenmade from alloy steel in order to overcomethe wearing tendency of the wire rope; such sheaves, however, are soexpensive to manufacture as to almost prohibit their use. Attempts havebeen made to construct a sheave of cheaper material having a hardenedwearing surface for the wire rope, but such sheaves have provenunsatisfactory, owing to the unsuccessful hardening of the groovedportion of the sheave.

One object of my invention is to economically produce a sheave of thisclass, made of a relatively inexpensive cast metal, ca- 7 pable of beingtreated to provide a hardened grooved wire rope wearing surface,designed to keep the wear down to a minimum. 7

In the accompanying drawings, which illustrate forms of sheavesor pulleywheels embodying my invention:

Fig. 1 is a central vertical sectional view of a sheave constructed inaccordance with my invention;

Fig. 2, a similar view, showing a modified form of my invention; and pFig. 3, a side elevational view of the sheave. V

Referring to the drawings, eachof the sheaves shown includes a hub 5having an opening '6, aperipheral enlarged portion "or 40 rim 7 and anintermediate body portion 8 located between the hub and the portion 7Portion 7 is formed with a groove 9, an annular opening or space 10, andwith a series of openings 11 leading from the annular space 10 to theouter surface of the enlarged portion 7.

In the form of sheave shown'in Fig. 2,

there are two spaced apart annular spaces 10 adjacent the grove 9,instead of the single opening 10. This latter form of 1926. Serial No.118,212.

sheave provides a constructionthat is, prob- I ably better adapted forheavy work than the form of Fig. 1.

A characteristic and important feature offthe present invention residesin hardening the metal entering into the formation of the groove and aportion of the metal] adjacent the groove. In the form of Fig. 1, aandbdesignate the hardened surfaces, and in Fig. 2, c and (Z designatethe'saids'hardened surfaces, In casting the sheave, it is preferablyformed in sand molds, which are provided with. a suitable core or coresto form the space 10, and with chill pieces or members to form thehardened surfaces (1 and b of the, form of Fig.1. In addition toproviding the molds with the said means for forming the annularspacel0iand the surfacesv a and b, means are. provided for forming thepassages or openings 11. These openings 11 are provided to permit thecore and the chill pieces employed in forming the space and effectingthe desired hardening to be removed.

Infollowing my method of manufacture, it isimportant that provision bemade to produce a casting having the cross section of that portion ofthe rim between the groove and the interior annular space of uniformcross section, and of such a thickness that the said portion may beproperly hardened by chilling. In the forms illustrated, it will benoted that I have provided constructions embodying these features.

The method followed in making the :sheave of the form of Fig. 2 isverysimilar to the method employed in manufacturing the form of Fig. 1,the'main difference being that two independent cores or a series ofindependent cores are used for formingthe two spaced apart annularopenings 10*, and, of course, chill pieces are employed for chillingportions of the walls of the two interioropenings 10*. By making theabove mentioned cross sections relatively uniform, the desired groovedsurfaces and the surfaces of the metal adjacent thereto may be properlychilled, thereby providing a satisfactory hardened wearing surface on aV Y Y f A 136L825 sheave made fromrelatively soft and inexpensivematerial. i 1 What I claim is: V 7 1. A cast metal sheavevhaving a hub,a

body portion extending therefrom consisting of a single relatively thickWa ILL-a im surrounding the body portion, said-rim having an exteriorgroove and an annulanspace I relatively olo'sethereto, and the Wall ofthe surjrounding' the'body portion, the transverse extent of metal nsedi'n' thebody portionan'd' 1 sheave between said groove and said space bbeing Chilled onits periphery and ion the surface opposite to saidperiphery.

2. A castmetal sheave having a'hub, r"a

body portion extending therefrolnconsista ing of a-single relativelythiekwall, a rim surrounding the body portion, said rim h'av- I v I ,ingan exterior groove and an annular space relatively close thereto, andthe "Wall of the sheave between said groove and said spacebeinghard'ened'on its periphery-and on the l surfaceopposite to "saidperiphery.

8. A cast-metal sheave having a ha-b, "a body portion -extendingtherefrom, Fa "rim rim being substantially the same, saicl having aperipheral groove and an annular space relatively o'lose to, "the'groov'e; 'and V openings communicating with said space arranged at-substantially the junetion of said body and'rijinandthewallbetW'eensa-id groove and "space being chilled on opposite r sides.

IntestimonyvvhereofI aifixfrny signature. I

' EDGAR 7V

